【解决办法】创建标绘图层并添加标绘后设置 plottingLayer._geoGraphicObjects[i].sizeInMeters = true.参考代码如下:
// 创建标绘图层
let plottingLayer = new cesium.PlottingLayer(scene, "plottingLayer");
scene.plotLayers.add(plottingLayer);
// 注: 该代码省略了添加标绘的代码,需要可参考示例http://support.supermap.com.cn:8090/webgl/Cesium/examples/webgl/editor.html#plot_dynamicPlot
for(let i in plottingLayer._geoGraphicObjects) {
// 设置标绘图层中的所有标绘随图缩放
plottingLayer._geoGraphicObjects[i].sizeInMeters = true.
}